How to track a method result in Java

Briefly speaking, I am working on developing a system which is able to give you information about the results provided by the execution of a java program. I have considered the following problem, and I do not know if it is possible to solve it in java.

I have the following classes:

public class ClassA {
    ClassB classB= new ClassB();
    public Integer method1(){
       return classB.method2();
    }
}

public class ClassB {
    ClassC classC = new ClassC();
    public Integer method2() {
        return this.classC.method3() + this.classC.method4();
    }
}

public class ClassC {
    public Integer method3() {
        return 3;
    }
    public Integer method4() {
        return 4;
    }
}

So far I can capture each invocation of the methods by using dynamic proxies. In particular, I am using the Proxy and the InvocationHandler objects from the package java.lang.reflect. Here there is the example I followed (http://ift.tt/2ynn165).

My question is if someone knows how can I give information such as: "the return of method1() is generated from the return of method2(), and the return of method2() is in turn generated from the return of method3() and the return of method4()".